Loss to man utd was frustrating day for watford pearson

I think I can help you with that!

The quote you're referring to is likely from Watford's manager, Roy Hodgson, not Pearson. On January 3, 2022, Watford lost 1-0 to Manchester United in the Premier League, and Hodgson was quoted as saying:

"It was a frustrating day for us. We didn't create enough chances, and when we did, we didn't take them. Manchester United are a good team, but we're better than we showed today."

Roy Hodgson has been the manager of Watford since September 2021, while Pearson is actually the manager of Nottingham Forest.